Description:Hundreds pack into a small square outside of Rome to hear an address by Pope Francis. A rousing ovation greeted the pontiff as he emerged from his sprawling summer retreat in Castel Gandolfo. He offered a prayer to mark the 70th anniversary of the massacre of tens of thousands of Poles during World War Two. He also said he was looking forward to an impending trip to Brazil, where millions of Catholics are expected to gather for World Youth Day.(0:54)